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Yeah, I'm having these sorts of weird problems too.
What web browser are you using?
I have tried adding articles via AMS, using Koivi editor, with both Firefox and Internet Explorer on two different machines.
Firefox has no trouble on either machine, but on one PC when I use IE it has what sounds like the same problem you are having, yet when I use IE on the other PC it has no problem!
The problem being that I can edit only the plain text input fields (like "Title", "Banner/sponsor" & "Select file"), but NOT the wysiwyg fields "Article Text" or "Extended Text". However, both those fields ARE editable if I select the "HTML" check box(es) on the bottom right corners of those fields.
This certainly indicates a problem with how IE is configured on my first PC, but I haven't had a chance to properly compare and contrast the settings with each other - I will have to try that later this evening or at the weekend.